Koichiro Iketani leads the Akina SpeedStars street racing team, piloting a lime green 1988 Nissan Silvia K's (S13). His middle school childhood featured fishing trips with best friend Kenji on Lake Akina. At 18, he earned his license through driving school before acquiring the Silvia and assuming SpeedStars leadership while employed at Shibukawa's Esso gas station alongside Takumi Fujiwara and Itsuki Takeuchi. Iketani introduced Takumi and Itsuki to Gunma's street racing scene by inviting them to a SpeedStars meet. Facing a challenge from the professional Akagi RedSuns, he acknowledged the team's limitations and sought external aid. Boss Yuichi Tachibana revealed a rapid tofu-delivery Toyota Sprinter Trueno AE86, prompting Iketani to recruit its owner, Bunta Fujiwara. Bunta declined due to age but advised intensive practice and road familiarity. During subsequent practice for the RedSuns battle, Iketani lost control on a corner, collided with a guardrail, and sustained minor head and neck injuries. His heavily damaged Silvia forced his withdrawal, leading him to facilitate Takumi’s substitution as the Eight-Six’s driver against Keisuke Takahashi. Post-Takumi’s rise, Iketani maintained a supportive role. After Silvia repairs, he test-drove Akina with Itsuki, only to be ambushed by Myogi NightKids’ Shingo Shoji. Shingo bumped Iketani’s car, causing a spinout. Iketani later demanded an apology, triggering Takumi’s "Duct Tape Death Match" against Shingo. Ahead of Takumi’s race against Ryosuke Takahashi, Iketani lent his Silvia to Takumi for undisclosed purposes. Years later, Iketani managed a gas station, remained unmarried, and experienced balding. He occasionally discussed the MFG racing series with acquaintances like Kenji during gas station visits.